Assertion: Mucosal epithelium of gut has goblet cells which secrete mucus.
Reason: The mucus in the gastric and pancreatic juice protects the mucosa from excoriation by acidic secretion.

Options

A. If both assertion and reason are true and reason is the correct explantion of assertion
B. If both assertion and reason are true but reason is not the correct explnantion of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that the mucosal epithelium of the gut has goblet cells that secrete mucus. This is true because goblet cells are specialized epithelial cells found in the lining of the gastrointestinal tract. Their primary function is to produce and secrete mucus, which plays a crucial role in protecting the gut lining.

**Hint**: Recall the function of goblet cells in the gastrointestinal tract.

2. **Understanding the Reason**: The reason provided states that the mucus in gastric and pancreatic juice protects the mucosa from excoriation by acidic secretion. This is also true. The mucus acts as a protective barrier against the harsh acidic environment created by hydrochloric acid (HCl) in the stomach and helps to neutralize the acidity in the pancreatic juice.

**Hint**: Consider the role of mucus in protecting the stomach lining from acid.

3. **Analyzing the Relationship**: While both the assertion and the reason are true, we need to determine if the reason correctly explains the assertion. The assertion focuses on the presence of goblet cells in the gut and their function in mucus secretion, while the reason discusses the protective role of mucus against acid.

**Hint**: Think about whether the reason directly supports the assertion or if it introduces a different aspect.

4. **Conclusion**: Both the assertion and the reason are true statements, but the reason does not serve as a correct explanation for the assertion. The assertion is about the presence of goblet cells and their function, while the reason discusses the protective role of mucus against acid, which is a different aspect.

**Hint**: Reflect on how the reason relates to the assertion and whether it provides a direct explanation.

### Final Answer:
Both the assertion and the reason are true, but the reason is not the correct explanation for the assertion.